voluptasmollitia/docs-exp/firestore_lite.doc_2.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/firestore](./firestore.md) &gt; [lite](./firestore_lite.md) &gt; [doc](./firestore_lite.doc_2.md)

## doc() function

Gets a `DocumentReference` instance that refers to a document within `reference` at the specified relative path.

<b>Signature:</b>

```typescript
export declare function doc(reference: DocumentReference<unknown>, path: string, ...pathSegments: string[]): DocumentReference<DocumentData>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  reference | [DocumentReference](./firestore_lite.documentreference.md)<!-- -->&lt;unknown&gt; | A reference to a Firestore document. |
|  path | string | A slash-separated path to a document. |
|  pathSegments | string\[\] | Additional path segments that will be applied relative to the first argument. |

<b>Returns:</b>

[DocumentReference](./firestore_lite.documentreference.md)<!-- -->&lt;[DocumentData](./firestore_lite.documentdata.md)<!-- -->&gt;

The `DocumentReference` instance.

## Exceptions

If the final path has an odd number of segments and does not point to a document.